How to use JavaScript code? How to introduce HTML page? The following article will introduce to you two ways of writing JavaScript code into HTML pages. I hope it will be helpful to you.
#Before learning JavaScript, we should first understand how to use JavaScript code? Let's take a look at the usage of js code.
We use JavaScript code in two ways: One is to embed js code directly in the HTML page, and the other is to link to external JavaScript files.
Let’s look at the first usage first: directly embedding js code in the HTML page
If we embed the JavaScript code directly in the HTML page, we need Using the <script> tag, <script> and </script> tells JavaScript where to start and end.
<script> and </script> The line of code between Script tags can be inserted.
You may see type="text/javascript" used in the <script> tag, but this is no longer necessary. JavaScript is now the default scripting language in all modern browsers as well as in HTML5. </script>
Let’s look at a specific example
<script>
alert("My First JavaScript");
</script>The above code is to embed js code directly in the HTML page.
Then let’s take a look at the
second usage of js code: by linking to external JavaScript files. Sometimes if there are too many JavaScript codes, we can put the codes separately in JavaScript files and link them together.
We can follow the following steps to link external JavaScript files
1. First, we create a JavaScript file with an extension of .js
2. Then we will write The js code is written into the Js file and the file is saved.
3. Use the script tag to link the JavaScript file to the HTML file
One thing to note is that in a script tag that has introduced an external js file, you cannot write Js commands in its start tag and end tag.
Let’s look at a specific example
We first create a js file sample.js
Then write the js code
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
document.write("<h1 id="This-nbsp-is-nbsp-a-nbsp-heading">This is a heading</h1>");
document.write("<p>This is a paragraph</p>");
</script>
</body>
</html>Finally Use script tags to link JavaScript files to HTML files
document.write("<p>This is a paragraph</p>");The above are the two methods used by js code
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